RFR: 8308594: Use atomic bitset function for PackageEntry::_defined_by_cds_in_class_path

[Coleen Phillimore]

On Thu, 25 May 2023 22:01:38 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> Please review this simple fix for replacing the implementation in `PackageEntry::set_defined_by_cds_in_class_path()` with `Atomic::fetch_then_or()`.
> 
> Passed tier1 testing.

Yes. Looks trivial.

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PR Comment: https://git.openjdk.org/jdk/pull/14164#issuecomment-1564713111